Encoding photonic angular momentum information onto surface plasmon polaritons with plasmonic lens
Encoding photonic angular momentum information onto surface plasmon polaritons with plasmonic lens
复制标题
使用等离子体透镜将光子角动量信息编码到表面等离子体激元上
DOI：
10.1364/oe.20.024151
复制
发表时间：
2012-10-22
期刊：
影响因子：
3.8
通讯作者：
Guo, Guoping
中科院分区：
文献类型：
--
作者：
Liu, Aiping;Rui, Guanghao;Guo, Guoping
在经典光学和量子光学中，自旋角动量(SAM)和轨道角动量(OAM)都可以用来携带信息。本文利用纳米环形塑料透镜演示了表面等离子体激元(SPP)对光子角动量(AM)信息的编码。用近场扫描光学显微镜(NSOM)测量了等离子体透镜受到SAM和OAM不同组合的光子激发时金属表面的近场能量分布。结果表明，SAM和OAM都会影响SPP的近场能量分布。更有趣的是，数值和实验研究表明，等离子体透镜表面的能量分布由总AM的绝对值决定这直接证明了SPP可以同时利用光子SAM和OAM信息进行编码，利用光子OAM和等离子体透镜之间的相互作用可以消除光子的自旋简并。这些发现不仅有助于对光子AM的基本理解，而且对未来等离子体量子光学器件和系统的设计也是有用的。(C)2012年美国光学学会
Both spin angular momentum (SAM) and orbital angular momentum (OAM) can be used to carry information in classical optics and quantum optics. In this paper, the encoding of angular momentum (AM) information of photons onto surface plasmon polaritons (SPPs) is demonstrated using a nano-ring plamonic lens. Near-field energy distribution on the metal surface is measured using a near-field scanning optical microscope (NSOM) when the plasmonic lens is excited by photons with different combinations of SAM and OAM. It is found that both the SAM and OAM can influence the near field energy distribution of SPPs. More interestingly, numerical and experimental studies reveal that the energy distribution on the plasmonic lens surface is determined by the absolute value of the total AM. This gives direct evidences that SPPs can be encoded with the photonic SAM and OAM information simultaneously and the spin degeneracy of the photons can be removed using the interactions between photonic OAM and plasmonic lens. The findings are useful not only for the fundamental understanding of the photonic AM but also for the future design of plasmonic quantum optics devices and systems. (C) 2012 Optical Society of America